Dipper-tooth.



W. G. NICHOLS.

DIPPER TOOTH.

APPLICATION mu) FEB. n. 1915.

Patented Oct. 9, 1917.

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l ,4 "Off/V57 WITNESSES UNITED STATES PATENT OFFICE.

WESLEY G. NICHOLS, OF CHICAGO HEIGHTS, ILLINOIS, ASSIGNOR TO AMERICAN MANGANESE STEEL COMPANY. OF AUGUSTA, MAINE. A CORPORATION OF MAINE.

DIPPER-TOOTH.

To all whom it may concern.-

Be it known that I, lVnsLnv G. NIonoLs, a citizen of the United States, and a resident of Chicago Heights, in the county of Cook and State of Illinois, have made and invented certain new and useful Improve ments in Dipper-Teeth, of which the fol lowing is a specification.

This invention relates to dipper teeth, and more particularly to that class which are formed with removable points.

It has heretofore been found extremely dillicult to prevent the jaws of the point from Spreading, due to the severity of the service to which the same is necessarily exposed, without excessively weakening the nose of the base. It has also been found, in some classes of dipper teeth, that the securing bolts are, in themselves, inadequate to prevent this spreading of the point jaws, and it is therefore the object of the present invention to so form the nose and point, that the jaws will be positively held against spreading by the nose of the base, without materially weakening the latter, and further, to so arrange the various parts, as to eliminate some of the securing bolts, and to materially reduce the strain to which the other of the-bolts are exposed.

A, further object is to provide a dipper tooth including a base and a removable point, wherein the upper jaof the point is provided with a l'g w is substantially dove-tail in cross-sect and which lug is of uniform thickness roughout, so that the holding action, between the lug and the undercut or dove-tail recess with which the base is provided and in which the lug seats, is not limited to one end of the lug,

but extends throughout the entire length thereof. In connection with the fioregoing, there is provided a lug upon the lower jaw of the point which is of uniform width and thickness and is accordingly directly insert,

ihlo within a recess in the lower portion of the tooth base; the holding action of the lower lug being supplemented by project ing the lower jaw of the point rearwardly and bolting, or in other ways securing, it to the base.

Other objects and advantages will ap pear as the description proceeds, it being understood that changes in the precise em- Speeification of Letters Patent.

Patented Oct. 9, 1917.

Serial No. 8,746.

bodiment of i'lh' invention can be made Within the scope of what is (:lainnrd, without departing from the spirit of the in vention.

The preferred embodiment of my invention is disclosed in the accompanying drawings, wherein Figure 1 is a view. in top plan, of a dip per tooth embodying the features of my invention Fig. 2 is a side view in longitudinal section thereof;

Figs. 3 and 4 are views in cross-section, taken on the lines 3 3 and -1-4 respectively of Fig. 2; i

Fig. 5 is a fragmental view in perspective of the removable point;

Fig. 6 is a similar view of the front portion of the tooth base with which the point. aforementioned, engages;

Fig. 7 is a detail view. in section, illus- (rating the manner in which the point is assembled upon the base.

Referring to the drawings, wherein similar reference numerals designate correspondlug parts throughout, a base 7 is provided with the usual enlargement at its front extremity, forming the nose 8, which is slotted as at 9, for the reception of the front wall of a dipper bucket. A removable point 10 is provided with the rearwardly diverging, upper and lower jaws 1112, which are adapted to fit against the similarly inclined faces 13, 13 0f the nose of the base.

The excessive weight, which is brought to bear upon the front extremity of the tooth point, tends to force the upper jaw 11 away from the inclined face 13' of the nose, and, in order to prevent this, the upper jaw is provided with an elongated dovetailed or undercut lug 14, the same projectin a substantiall from t e inner face of t e jaw and extending longitudinally thereof and preferably disposed along the median line. The u per inclined face 13 of the nose is provi ed with the Ion itudinaily extending undercut or dove-tai shape slot 15, extending throughout the entire length thereof, and so formed uniform distance as to receive the lug 14 therein when the lug is moved in an endwise direction with respect to the slot, and prevent its direct outward disengagement therefrom.

The lower jaw 12 of the point is provided upon. its inner face with the outstanding elongated lug 16, of substantially uniform cross-section 'throughout, the same being adapted to snuglyfit within a recess 17, provided therefor within the nose 8. In this connection, it is to be noted that the recess 17 (lUt'S not extendrto the extremity of the nose, but stops at distance therefrom, the point being assembled or secured upon the nose in a manner as illustrated in Fig. 7. The lugs 1-1 and 16 c-o-act in holding the point against side or lateral movement while the spreading of the jaws is rigorousl y prevented by the securement of the upper jaw to the tooth nose at a point adjacent the extremity of the former. The upper jaw 11 therefore terminates adjacent the extremity of the upper inclined surface 13' of the nose of the base. i

The lower jaw 12 of the point extends along the lower surface of the enlarged portion of the base, and is provided with the bolt openings 18, which are adapted to register with the similarly disposed openings 19 extending through the base, thus providing for the reception of suitable securing bolts, whereby the lower jaw. of the removable point is rigidly secured to the tooth base. The rear portion of the tooth base is also provided with a number of bolt openin s 20 which are adapted to receive bolts t erethrough, which, in connection with the bolts which pass through the openings 19, are adapted to rigidly secure the tooth to a dipper bucket or analogous structures. The point is cored, as at 21, in order to lighten the same and the base is cored or slotted, as at 22, for a similar reason. The limited depth to which the slot 15 extends, prevents the nose from being materially weakened, as it would necessarily be, were it completely bifurcated for the reception of a web there in, with which removable points are sometimes equipped.

The undercut slot 15 with which the nose of the tooth base is provided, is of uniform depth; and the undercutlug of the upper jaw of the point. being of uniform thickness, provides for the rigid securement and anchorage of the upper 'aw of the point throughout practically its entire length.these features being obtained with a minimum weakening of the nose of the ,base. By combining with the foregoing features :1 lug upon the lower jaw of the point, which is either of uniform width or tapers toward its outer surface, a most secure anchorage for the point against lateral strains is provided, and the spreading of the two jaws of the point is prevented by the dove-tail lug upon the upper jaw and the rearwardly-extending projection with whichthe lower jaw is provided.

What I claim is i 1. A base for a dipper tooth comprising an enlarged front portion with inclined faces forming a nose, the upper inclined face of said nose prowided with an undercut slot 1 extending the entire length thereof, the lower inclined face of said nose provided with a longitudinally extending recess of limited extent and terminating short of the front extremity of the lower face.

2. A tootli of the class described. consisti ing of a base} with a nose at the front extremity thereof having inclined faces, thc upper inclined face of the nose provided:

with a slot of substantially uniform depth throughout and substantially dove'tail or undercut in cross-section. and a removable point including rearwardly diverging jaws adapted to seat against the inclined faces of the nose. a lug extending along the under face of the upper jaw of the point, substan'-,

tially dove-tail or undercut in crosssection and of substantiallyuniform thickness throughout, and insertible in said slot by endwise movement with relation thereto, the lower aw of said point provided with a.-

rearward extension adapted to be secured to the base.

3. A tooth of the class described. consisting of a base with a nose at the front extremity thereof having inclined faces, theupper inclined face of the nose provided,

with a slot of substantially uniform depth: throughout and substantially dove-tail or,

tially dove-tail or undercut in cross-section.

and of substantially uniform thickness .tl'ironghout, and insertible in said slot by.

endwise movement with relation thereto, the lower inclined face of the nose provided with a slot therein, and the inner face of the lower jaw of the point provided with a lug directly insertihle within said Slot in the lower inclined face of the nose.

4. A toothof the class described. consisting of a base with a nose at the front ex-= tremity thereof'ihaving inclined faces, the upper incliner.l, face of the nose provided with a slot ofsubstantially uniform depth throughout and substantially dove-tail on undercut in cross-section. and a removable point including rearwardly diverging jaws adapted to seat against the inclined faces of the nose. a lug. extending along the under face of the ripper jaw of the point, substam tmlly dovje tailor undercut in cross-section and of substantially uniform thickness throughout, and'insertible in said slot by endwise movement with relation thereto, the

lower jaw of said point rovided with a rearward extension adapte to be secured to the base. the lower inclined face of the nose provided with a slot therein, and the inner face of the lower jaw of the point provided,

with a lug directly insertible within said slot in the lower inclined face of the nose.

5. A base for a dipper tooth consisting of an enlarged front portion having inclined faces and forming a nose, the upper inclined face of said nose provided with an undercut or dove-tail slot extending lengthwise thereof, with the bottom Wall of the slot extending substantially parallel to the said inclined a face of the nose provided with a slot extending lengthwise thereof.

6. A removable point for a dipper tooth consisting of a Wedge-shape member with Co of the nose, the lower inclined rearwardly diverging jaws, the upper of said jaws rovided upon its inner face with a longitudinally extending lug substantially dove-tail or undercut in cross section and of substantially uniform thickness throughout, 20

WESLEY G. NICHOLS.

Witnesses:

UnAnLEs FAHLsTRoM, MARY I. LA ZELLE. 

